Mindfulness or Mindlessness?

[vulcanlogician]

You see red because one of three spectrum filtering cone structures in your retina picks up red. 

The spectrum filter in your eye picks up light of different wavelengths. Certain cones (the ones we say pick up "red") actually pick up light of around 680-700 nanometers in wavelength. The eye/brain/mind then interprets this as red. Red does not exist in the world.

Now, light with a wavelength of 680-700 nanometers does exist. So in that way, "red exists." But there is no necessity for us to perceive that as red. It is a quirk of our organism that we do. This property "red" exists nowhere outside of our minds.

The first thing to remember is that colour does not actually exist… at least not in any literal sense. Apples and fire engines are not red, the sky and sea are not blue, and no person is objectively "black" or "white".

What exists is light. Light is real.

https://www.bbc.co.uk/news/science-environment-14421303